Sharp Bros THE JACK AR15 Lower Receiver

The Jack - Gen2 features now include a threaded bolt catch pin, reduced weight and improved styling - and lower costs to you.
Other standard features:
An oversized integral trigger guard
A beveled magazine flare that helps you load as quickly and efficiently as possible
Machined top to bottom from 7075-T6 aluminum, a peak-strength corrosion-resistant aluminum alloy
A hard coat anodize finish per MIL-A-8625, the anodizing model for model for most military and aerospace products
Full compatibility with all mil-spec internal parts
Full compatibility with all other aftermarket mil-spec upper receivers
Full compatibility with PMags, Hex mags and other standard capacity magazines
Multi caliber mark
Weight: 10.7 oz